The fluid was very black and burnt when I dropped the pan and changed the filter 2 years ago. The pan didn’t have anything in it that concerned me and the magnet didn’t look too bad. The plan was to do a few drain and fills over a few days following the initial pan drop to cycle some fresh fluid...
John Deere Hy-Gard
Chevron 1000 THF
Mobilfluid 424
Shell Rotella HD Tractor Fluid available @ TSC
John Deere Hy-Gard (different link with more info - au)
I think you would be hard pressed to find a better fluid that is more readily available than John Deere Hy-Gard. You have to be careful...
BG Dynamic Engine Cleaner
There are a multitude of videos on YouTube demonstrating the cleaning ability of this stuff. It’s fairly expensive but appears to be very effective at cleaning an engine up quickly.
Before and after @ about 8:30
2004 GMC 2500HD 6.0/4L80E
97,755 miles
I did 3 consecutive drain and fills. I used Chevron Delo Syn ATF HD.
I pulled the pan and changed the filter 2 years ago at 94,341 miles. IIRC it took about 5.5 quarts to fill it up after I dropped the pan and changed the filter. The pan drop done in 2020...
2016 LML Duramax 3500HD
OCI: 6,973 miles & 630.9 hours (OLM @ 0%)
79,072 miles and 6,072.5 engine hours
Out: Mobil Delvac 1300 Super 15w40, PF2232
In: same
2010 Tacoma 4.0/A750F
50,810 miles.
I drained and refilled it for the first time today. I drained out a little over 2 quarts of factory fill WS. These have been known to be a little low from the factory. The factory fill looked pretty red draining from the pan but had a slightly brownish but...
2010 Tacoma
50,810 miles
OCI: 4,081 miles (5/14/21 to 4/10/22)
Out: ^
In: 5 quarts of Mobil 1 EP high mileage 5w30 + 0.5 quarts of Mobil 1 Annual Protection 5w30, 90915-yzzd3 & 90430-12031 (crush washer).
I drained and refilled the trans for the first time. I drained out just a touch over 2...
2017 L5P Duramax
34,588 miles and 1,790.9 engine hours.
OCI: 6,194 miles and 384.6 hours. OLM @17%, 4/9/21 to 1/31/22.
Out: ^
In: Mobil Delvac Extreme 15w40 (synthetic), ACDelco PF2232. Transfer case fluid changed, synthetic Dexron VI.